Boiler.



T. T. PARKER.

BOILER.

ATPLIOATIO'H mum in 2a, 1913.

3000000000. 7 oofioofioooo 0 INVENTOR By Atomeys,

WITNESSES:

m: null: mus 0a.. maruuvmi. wuumarmv. n

T. T. PARKER.

BOILER.

APPLIOATIOH FILED MAY 28, 1913.

O O O O O O O O- O ooooooooo OOOOOOQOOOOO INVENTOR WITNESSES:

By ttorneys,

rur Mums versus :0 PHOYD-LIVKO vllsnmomm THOMAS 'r. PARKER, or NEW'YORK, N. Y.

BOILER.

Specificationof Letters Iatent.

Batented Nov. 11, 1913.

Application filed May 28, 1913. Serial No. 770,394.

To all whom it may concern Be it known that I, THOMAS T. PARKER, a citizen of the United States, residing in the borough of Manhattan, city, county, and

.State of New York, have invented certain new and useful Improvements in Boilers, of

which the following is a specification.

This invention relates to water tube boilers, particularly of the so-called horizontally inclined typeor that type in which the tubes are arranged in substantially horizontal position, being usually slightly inclined upwardly at the front.

In horizontally inclined water tube boilers as now, constructed there is more or less imperfect combustion of. the fuel, and the" roducts of combustion arelocalized or concentrated upon particular portions of the bank of tubes, principally the ends" of the lower ones. This results in excessive evaporation in the tubes nearest the fire and consequent frequent renewal of same together with an'uneconomical use of the-; fuel.

. According to the present invention I pro- ,vide a boiler in which a more complete combustion is'obtained and in which the combustion 1 productsare distributedmore equally among the tubes and evenly throughout the length thereof.

In the preferred construction of my invention I provide a boiler in which the water tubes are so arranged as toYprovide a secondary or supplemental combustion space or chamber above the lower level of the tubes, into which the heated gases are con-- strained to go before they pass in between the tubes. They are then. led laterally through the various sections, preferably throughout the entire length thereof, and preferably in such manner as to cause an equal transfer of heat to the various tubes, although the relative temperatures may be controlled to secure the best results.

The invention includes various other features of improvement which will be hereinafter more fully pointed out.

Referring to the drawings,Figure 1 is a transverse sect-ion of a boiler of the double pass type, embodying the present invention. Fig. 2 is a longitudinal section of Fig. 1. Fig. 3 is a detail of Figpl. Fig. 4 1s a transverse section of a slnglepass boiler, embodying the invent-ion. Fig. 5-is a trans fuel is attained.

verse section, showing a modified form. Flg. 6 1s a similar section of another modificat-ion.

Referring first to Figs. 1 to 3, let A-indic'ate, the boiler as a whole which is shown fas mounted upon a brick foundation or iframe work B. The foundation may not ;extend above the series of water tubes C, ,the outer cover of the boiler being made i of metal or other suitable material. The

iboiler is provided wit-h a front water box D and a rear water box E, between which the water tubes C extend. Above the rear water box E is a water drum F which connected by a series of tubes G with the front water boxD, and by a series of tubes Iii with the rear water box E. A complete circulation around the tubes is thus provided. The boiler is provided with a' fire box I, and grate J as usual, but instead of the top of the fire box or combustion chamber being open throughout its entire area, it is partially closed by afire-proof wall K so arranged as to proyide a central opening L through which the heated gases must passin order to reach the bank of tubes. According .to the invention I provide a supplemental combustion chamber M which in its preferred form comprises a space formed by omitting a number of tubes so that the chamber will be free or substantially free of obstructions. As the products of combustion pass directly upwardly through the opening L which forms the inlet to the- :ch-amber M the gases are thoroughly mixed and a more complete combustion of the In passing through the opening and into the'supple-mental combustion chamber the gases preferably do not strike any water cooled surfaces such as the water tubes, and the combustion which I is ordinarily checked by chilling is enabled to continue until the products :are substantially completely consumed. Preferably means are provided to cause a reduction of flow of gases in the oombustlon chamber so that a higher boiler efliciency is obtained This may be done in several ways, as for bust-ion chamber of larger cross sectional area than the chimney. I

In the double pass type of boller illustrated in 1 and 2, which'is usually of instance by mal'ring the supplemental comcomparativel large size, the supplemental combustion c amber is preferably arranged in the middle of the bank of tubes so that the heatedgases after-passing into the chamber branch out in opposite directions and pass laterally between the tubes on either side of the chamber and are finally carried up through passages arranged along the sides of the tubes. In order to promote this lateral movement of the gases and substantially prevent their passing directly upwardly to the top of the bank of tubes, I rovide below the top of the bank a wall which is preferably of fire-proof material such as asbestos. This Wall is inclined in the same direction as the bank of tubes, and eflectually closes the passage of the gases at this point, constraining them to move in substantially horizontal directions toward the sides of the banks of tubes. In the double pass type illustrated I provide on each side of the bank a wall 0 or O which is preferably of asbestos, and which is also preferably constructedso as to be easily removable from the tubes. To this end the wall may be provided with a hook or hooks designed to fit over one of the tubes C- as best illustrated in Fig. 8. The walls 0 O are formed with openings for the escape of the gases after the latter have passed through the bank of tubes. These openings are best seen in Fig. 2 at Pwherein they are conventionally illustrated as oblong slots. It will be understood that the shape and distribution of these openings are so proportioned and. arranged as to secure the desired fiow'of combustion gases through the bank or banks of tubes. In the preferred construction the proportions are such that there is an even distribution of the gases, the latter sweeping all of the tubes and pockets or dead spaces being avoided.

Upon passing through the Walls 0 O the gases which have given up a large proportion of their heat thence flow into vertical passages Q Q, which extend substantially the length of the tubes, and thence upwardly into the chamber It, and thence outwardly through the smoke pipe S.

According to my invention I provide a means for increasing the circulation of the boiler whereby the water is led from the front water box I) to the rear water box E without circulating through the drum F. To this end 'I )ro'vide a series of tubes T located in the chamber R and above the top wall or bafile N, so that the tubes do not receive the direct heat from the furnace, but are out of the path or the products of combustion after the latter have assed through the bank 01"- tubes. These tulies Tv which I may describe as down comer tubes are hence comparatively cool and form return passages for the water which are arranged ,tile, as shown at l well below the water line of the boiler. These tubes hence carry a large portion of the circulatin water, thus permitting the tubes Gr, whic lie at the water line of the boiler, to carry the more highly heated Water and steam into the drum F. Two means of circulation are hence provided, one at the waterline and through the drum, and the other below the water" line which connects the two water boxes directly.

It will be understood that the flow of gases through the tubes and passages Q Q, or elsewhere may be controlled if desired by dampers or the like. The provision of a supplemental combustion chamber such as M also enables me to very effectively superheat the steam, if this is desired. To this end I may provide an opening such asU (Fig. 1) in the rear box E and insert a superheater therethrough, the latter preferably occupying a position partly in the chamber and partly in the fire box L, as indicated at V in dotted lines in Fi 2. The necessary steam connections wil be understood without further description.

In Fig. 4 I have illustrated the invention as applied to a single pass boiler; In this type of boiler the bank of tubes is narrow laterally and the supplemental combustion chamber M is arranged'at one side as shown. In this construction there is preferably a series of tubes C arranged at one side of the combustion chamber, the space between which m. be filled with hollow At the opposite side of the bank of tubes a single perforated wall 0 is provided, the construction being such that all of the products of combustion are led to the right and through the perforations in the wall.

In Fig. 5 I have shown a modified form in which the wall 0 is omitted, the products of combustion being compelled to travel into contact with the various tubes by vertically arranged bafiie plates X X X, the

gases finally reaching the vertical passage Q around the lower end of the batlie X In Fig. 6 a similar arrangement is provided except that the baffles are angularly formed as shown at Y Y forced to travel upwardly into the combustion chamber M and thence in a series of passes to the right and left until they reach the lower part of the vertical passage Q.

In the various constructions shown the products of combustion are forced to enter into the supplemental combustion chamber M, and durin this process the gases are thoroughly mixed and a complete combustion takes place. A most important feature is that the'heated gases are then brought into contact with all of the tubes so that there are no dead spaces. A further important feature is that by the time the hot the gases being- 55. products of combustion laterally tliio ugh gases are led throughout the bank of tubestion chamber, said supplemental combustion they have given up their heat to such an extent that it is unnecessary to provide brickwalls around the tubes to prevent losses by heat radiation. The'present boiler may be constructed in more compact form than those now in use since the thorough combustionof the gases in the supplemental combustion chamber permits me to arrange the tubes closer together than iir other constructions wherein such chamber 1s omitted. In these latter constructions considerable space must be left between the tubes in order to prevent the immediate chilling of the gases: to apoint where additional combustion; isno longer possible, The construction: of Figs.:l and 2 is preferred since by thisconstructionthe gases can be brought into contact with all of the tubes, and the proper distribution of: the gases is easily determined. and controlled by the location andsiize of the open ings R. In. all of the constructi ns shown the asbestos Walls or bailies may be easily removed, thus creating a. free passage through-- out the entire bank of tubes. whereby the; latter can'be cleaned of ashes and. other dc;

posits by a steam or air jet,.and whereby easy access may be obtained'for replacing tubes'l when necessary v It will be understood that. while I have. shown and described several-.forms-of my in:

vention fl do not. Wishto be liihiltedi thereto, as various changes'canbema'detherein with: P

out. departing from. the, invention at c a m- -1 water tube boiler having. a combus tion chambeg-a series oh substantially horizontal Water tubes 'arra-nged'abovesaid com;v bust-ion chamber,-a sup 7 emental combustion chamber. over. said com ustion chamber, and,

a passage. leading directly trom saideom bustion chamber to said sigppl-emeilital com ementa combus ed on. at least two,

bustion chambe'nsaid. sup

tiion chamber being. bound sides bysaid tubes. 2.- A water. tub

boiler having a; coinbus tion chamber, a serieso i substantially honir' zontall water tubes arranged above. said combusti'onachamber,asupplementali combustion. hambe Over s embi st b chambe -e P ss e ls l' e teem em an mm 1011! chamber to: said. supplemental combustion chamber, said supplemental combustion chamber beinmbounded on at least twosides by said" tubes, and means for directmg the sai :seriesof tubes-- 7 3. .A water tube boiler. having acombus+ tion chamber, a series of.substantially horition: chamber tosaid supplemental min bus:

chamber being bounded on at least two sides by said tubes, and a wall at the to of saidcombustion chamber adapted to irect the products of combustion through said passage into said supplemental combustion chamber.

4:. A water tube boiler having a combustionchamber, a series of substantially horizontal Water tubes arranged above said combustion chamber, a supplemental combustion chamber over said combustion chamber, a passage leading directly from said combustion chamber to saidi supplemental combustion chamber, said supplemental combustion chamber being bounded on at least two' sides ,bysaid' tubes, a wall at the top of said combustion chamber adapted to direct the products ofi combustionthrough said passage into said sup lemental combustion chamber, anda Wall combustion.- I

5, wa ter tube boiler having combustionfchamber,.a. series ofi substantially horizontal water. tubes arranged above said combustion chamber, a supplemental com-' bustion chamber, over said combustion chain aaa. r ag flead-i g di ee y om a combustion: chamber tov saidsupplemental combustion-chamber, said supplementalcombastion chamber. being boundedon, at} least said tubes from, said combustion chamber into said: supplemental combustion. chamber through said; passage, a wallabove said tubes, and preventing upward escape of productsofcombust-ion, and means for controllinglateralflow of saidproductsof combustiorn- 1 6,: A, water tube boiler having a combustion. chamber, a" series; oi: substantially hori: z nta ater ub a ug above a dw v b shes ham r-s a pp m ta combus tion chamber over said combustion chamber, a 'passage leading directly from said combust-ion chamber to; saidfsupplemental comust- 11 chamb r s pp l mbu stion chamber being bounded on at leasttwo sides by said-tubes, alwall separating sai tuhesfmm. said, combustion chamber an directing, the products of combustion into saidi supplemental combustion chamher through saidpassa'ge, a wall. above saidtubes,-- and preventing upward escape ofproducts of: combustion, and meansfor all. of tubcs{before they escape.

tion chamber, a bankof substantially ho'rhv said; chamber, a; number- ,of;,- tubesbeing ove said seriesof tubes to prevent, direct upward escape of said productsiof .twd sides by said. tubes, a wall separating and directing the products ,ofcombustion 7. A. water tube boiler. having a.combus--- compelling the products of combustion to pass laterally into contact with substantially:

9ml wa er. tubes rr nged a the op-of ing direct-1y over and in communication with the combustion chamber, the passage between the two chambers being free from tubes whereby the products of combustion pass directly into said suplemental combustion chamber without being chilled by contact with water cooled surfaces, and combustion is completed in said supplemental combustion. chamber, .and means for leading the hot gases laterally into contact with the farthermost tubes and then discharging them laterally.

8. A water tube boiler having a combustion chamber, a series ,of substantially horizontal water tubes arranged above said combustion chamber, a supplemental combustion chamber over said combustion chamber, a passage leading directly from said combustion chamber to said supplemental combustion chamber, said supplemental combustion chamber being bounded on at least two sides by said tubes, a wall separating said tubes from said combustion chamber and directing the products of combustion into said supplemental combustion chamber through said passage, a wall above said tubes, and preventing upward escape of prodnets. of combustion, and means for controlling lateral flow of said products of co1nbustion, and means for retarding the flow of gases through the boiler.

9. A steam boiler comprising a bank of Water tubes, a front water box and a rear water box connected with said tubes, a return pipe for permitting circulation of the water, a combustion chamber arranged above the lowermost tubes and at least partially surrounded by said tubes, a wall b'ene-ath said tubes adapted to direct products of combustion into said combustion-chamber, a Wall above said bank of tubes and between the latter and said return pipe, and means for controlling the lateral escape of said products of combustion, said means comprising a perforated wall located at the side of said bank of tubes.

10. A steam boiler comprising a bank of water tubes, front and rear water boxes connccted to said tubes, a wall above said tubes,

a steam and water drum above said wall, a

series of return pipes leading from said front water box to said drum, and a series of down comer pipes below said return pipes and connecting said water boxes directly.

1,1. A steam boiler comprising a bank of water tubes, front andrear water boxes, a. combustion chamber within said bank of tubes, :1 wall-below said tubes for directing products of combustion to said combustion chamber, a wall above said bank of tubes adapted to prevent direct upward escape 0'? said products of combustion, a. wall at one side of said bank of tubes, and means for separably connecting said side wall to said bank of tubes.

12. A steam boiler comprising a bank of water tubes, front and rear water boxes, a. combustion chamber within said bank of tubes, a wall below said tubes for directing products of combustion to said combustion chamber, a wall above said bank of tubes adapted to prevent direct upward escape of said products of combustion, a wall at one side of said bank of tubes, and means for separably connecting said side wall to said bank of tubes, said means comprising hooks carried b said side wall and adapted to engage said tubes.

13. A steam boiler comprising a bank oi water tubes, a front water box and a rear water box connected by said tubes, a combustion chamber above the lowermost tubes, a lower wall adapted to direct currents of combustion into said chamber, an upper wall adapted to prevent direct upward escape of said products of combustion, and a superheater located partly within said combustion chamber.

14. A steam boiler comprising a bank of water tubes, :1 number of tubes being omitted from a part of the bank to provide a combustion chamber, a fireproof wall arranged beneath the bank of tubes and forming a passage for the products of combustion into said combustion chamber, an upper wall extending entirely across the bank of tubes, a side wall provided with and located to permit escape of said products of combustion at predetermined intervals, a vertical passage beyond said side wall, aseries of return pipes above said upper wall, and a chamber in which vertical passage.

15. A steam boiler comprising a combustion chamber, a bank of water tubes above said chamber, a number of tubes being omitted in the middle portion of said bank to provide a supplemental combustion chamber lying above the lowermost tubes, :1 bottom wall extending across the lower tubes and having a passage leadingvto said supplemental combustion chamber, a top wall extending entirely across the bank of tubes, and means for controlling the lateral escape of the products of combustion on eachside of said bank of tubes.

16. A steam boiler comprising a. bank of Water tubes, a number of tubes being omitted in the middle portion ol said bank to provide a supplemental combustion chamber lying above the lowermost tubes, a bottom wall extending across the lower tibcs perforations, said perforations being formed said pipes are arranged connected with said and having a pamage leading to said combustio-n chamber, a top Wall extending entirely across the bank of tubes, and means for controlling the lateral escape of the products of combustion on each side of said bank of tubes, said means comprising perforate-d side walls, one on each side of said bank and vertical passages into which said products of combustion are led through said side walls, said vertical passages lead- 10- ing to a chamber above the upper wall.

In Witness whereof, I have hereunto signed my name in the presence of two subscribing witnesses.

v THOMAS T. PARKER. Witnessesi THOMAS, F. WALLA E, Flinn WHITE.

copies of this patent may be obtained for five cents each, by addressing the Commissioner of latents, Washington, D. 0. 

